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Washington is struggling to make a deal that will couple an increase in the debt ceiling with a long-term reduction in spending. There is no reason for the players to make their task seem even more Herculean than it already is. But we should be prepared for upward revisions in official deficit projections in the years ahead—even if a deal is struck. There are at least three major reasons for concern.

First, a normalization of interest rates would upend any budgetary deal if and when one should occur. At present, the average cost of Treasury borrowing is 2.5%. The average over the last two decades was 5.7%. Should we ramp up to the higher number, annual interest expenses would be roughly $420 billion higher in 2014 and $700 billion higher in 2020....

The second reason for concern is that official growth forecasts are much higher than what the academic consensus believes we should expect after a financial crisis. That consensus holds that economies tend to return to trend growth of about 2.5%, without ever recapturing what was lost in the downturn....

Third, it is increasingly clear that the long-run cost estimates of ObamaCare were well short of the mark because of the incentive that employers will have under that plan to end private coverage and put employees on the public system. Health and Human Services Secretary Kathleen Sebelius has already issued 1,400 waivers from the act's regulations for employers as large as McDonald's to stop them from dumping their employees' coverage....